Bump build time to 60 minutes

Somehow this PR is taking longer to build, I assume from somehow missing
the build cache.

Assuming that it's a caching issue, bump up the time to satisfy un-cached builds.
If build times continue to increase we will run into this problem again (can only
regenerate the cache with a successful build but a successful build needs the cache),
but this will let us defer it a bit longer :)  Travis-CI builds are max 120 minutes.

.travis.yml

@@ -78,7 +78,7 @@ before_script:
 
 script:
   - ccache -z
-  - ninja -j4 pyston check-deps && PYSTON_RUN_ARGS=G travis_wait 45 ctest --output-on-failure
+  - ninja -j4 pyston check-deps && PYSTON_RUN_ARGS=G travis_wait 60 ctest --output-on-failure
   - ccache -s
   - if [ -n "$(git status --porcelain --untracked=no)" ]; then echo "test suite left the source directory dirty"; git status; false; fi